Commutative semigroups whose homomorphic images in groups are groups.
Semigroup forum, Tome 3 (1971), pp. 51-57.

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@article{SF_1971__3_133843,
     author = {M.S. Putcha},
     title = {Commutative semigroups whose homomorphic images in groups are groups.},
     journal = {Semigroup forum},
     pages = {51--57},
     publisher = {mathdoc},
     volume = {3},
     year = {1971},
     zbl = {0235.20058},
     url = {http://geodesic.mathdoc.fr/item/SF_1971__3_133843/}
}
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M.S. Putcha. Commutative semigroups whose homomorphic images in groups are groups.. Semigroup forum, Tome 3 (1971), pp. 51-57. http://geodesic.mathdoc.fr/item/SF_1971__3_133843/